Jerk-line connection



` 1,622 070 March 22 1927' Y P. A. TRAPP JERK LINE CONNECTION FiledApril 29. 192s Patented Mar. 22, 1927.

traan.. T ATE-SM- PATRICK A. TRAIP, OF SHELBY, MONTANA.

Application led April 29, 1926.

The object ot the invention is to provide a device for effectingconnection between a jerk line and the wrist pin of the crank carried bythe band wheel or drive pulley of a well drilling apparatus to absorbthe jar and thus reduce the likelihood oit' damage or rupture of thespudding line, either through the sudden jerk caused by the tool failingto reach bottom when dropped or through buckling of the spudding linewhere it is attached to the tool; and to'provide a simple and cheapdevice practically adapted to replace ythe double manila line ordinarilyemployed and whose elasticity is depended upon to relieve the jar.

With this object in view, the invention consists in a construction andcombination of parts of which apreferred embodiment 1s illustrated inthe accompanying drawings, wherein:

Figure 1 is a general view of a drilling apparatus showing the manner otemployment of the invention.

Figure 2 is an enlarged detail elevational view of the invention.

Figure 3 is a longitudinal sectional view on the plane indicated by theline 3-3 of Figure Figures 4 and 5 are transverse sectional viewsrespectively on the planes indicated by the lines 4 4 and 5 5 of Figure2.

Primarily a shock absorber to cushion the jars resulting from thefailure of the drill to hit bottom and to absorb the j ar or shock asthe slack of the spudding line is taken up when the drill is raised, theinvention consists of a slide frame 10 in which is mounted a slidebearing 11 rotatably mount- Serial No. 105,616. v "if The block 18 iscounterbored -from the inner end, as indicated at 19, and in thiscounterbore is seated a sleeve 20, the latter TERK-LINE CONNECTION. y

having a tapering bore 21, the larger end ot which opens at the innerend ofthe block. This tapering bore is axially aligned with the bore 22in the protruding extremity of the block. The terminal of the jerk line23 is inserted through the bore A22 and lies in 00 the tapering bore otthe sleeve 20, those strands within the sleeve being untwisted to spacethem apart and permit the filler 23', which is ot a low melting pointmetal, to

completely surround them and embed them G55 so that the terminal of thejerk line is securely held in the sleeve and, the latter being looselymounted in the bore of the block, a swivel connection is providedbetween thc jerk line and the trame 10.

The slide bearing 11 has a limited movement longitudinally of the frame10, its travel in the direction of the connected end of the jerk linebeing limited by a screwstud 24 axially aligned with `the bore 22 75 andthreaded into the bearing block as at 25, the shank ot' the stud passingslidably through an eye 26 in the extremity of the trame and the head 27of the stud abutting the outer tace ot said extremity. A compressionspring` 28 of spiral Jform and of sufficient strength is disposed insurrounding relation to the screw-stud and compressed between thebearing block and the extremity of the trame and yieldingly im-V pelsthe bearing block toward that end of the frame with which the jerk lineis connected, so that the :torce of raising the tool or cushioning ashock on the spudding line results in compression of the spring.

As a means tor lubricating the wrist pin, a grease cup 29 is provided,being mounted in the bearing block in alignment with and diametricallyopposite the screw-stud 24.

The invention having been described, what is claimed as new and usefulis:

A device for the purpose indicated comprising an open frame, a wrist pinbearing block slidably mounted in the trame, means tor connecting theterminal of a jerk line to the trame at one extremity, a limiting stopprecluding movement of the bearlng block beyond a certain point in theframe in the direction of the connected end of the jerk line, and acushioning device acting in opposition to said limiting stop, the limit-5 ing stop consisting of a screw-stud slidabiy engaging the frame andhaving a ixed connection with the bearing block, and the cushioningdevice comprising a spiral spring in surrounding relation to the studand compressed between the block and the extremity of the frame.

In testimony whereof he aiiixes his signature.

PATRICK A. TRAPP.

